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Definitions

• Piperidine derivatives their process for preparation, their use as therapeutic agents and pharmaceutical compositions containing them.
• the present invention concerns novel N-benzyl-piperidine derivatives having pharmaceutical activity, to processes for preparing such derivatives, to pharmaceutical compositions comprising such derivatives and to the use of such derivatives as active therapeutic agents.
• N-benzyl-piperidine derivatives are disclosed in WO 01/14333.
• 2-(Benzothiazolylthio)acetamides have been disclosed as CCR3 selective antagonists (Chem. Pharm. Bull. (2003) 51(6) 697-701).
• the compounds of the present invention are active CCR3 antagonists and are advantageous because they have a high level of metabolic stability as shown by their intrinsic clearance.
• a pharmaceutically active ingredient's intrinsic clearance is a prediction of how rapidly the active ingredient would be cleared from a mammalian body, that is, it is predictor of the amount of active ingredient that would be cleared from (or s metabolised by) the body in a unit of time.
• Chemokines are chemotactic cytokines that are released by a wide variety of cells to attract macrophages, T cells, eosinophils, basophils and neutrophils to sites of inflammation and also play a role in the maturation of cells of the immune system. Chemokines play an important r ⁇ le in immune and inflammatory responses in various 0 diseases and disorders, including asthma and allergic diseases, as well as autoimmune pathologies such as rheumatoid arthritis and atherosclerosis. These small secreted molecules are a growing superfamily of 8-14 kDa proteins characterised by a conserved four cysteine motif.
• the chemokine superfamily can be divided into two main groups exhibiting characteristic structural motifs, the Cys-X-Cys (C-X-C, or ⁇ ) and Cys-Cys (C- s C, or ⁇ ) families. These are distinguished on the basis of a single amino acid insertion between the NH-proximal pair of cysteine residues and sequence similarity.
• the C-X-C chemokines include several potent chemoattractants and activators of neutrophils such as interleukin-8 (IL-8) and neutrophil-activating peptide 2 (NAP-2).
• the C-C chemokines include potent chemoattractants of monocytes and lymphocytes 0 but not neutrophils such as human monocyte chemotactic proteins 1-3 (MCP-I, MCP-2 and MCP-3), RANTES (Regulated on Activation, Normal T Expressed and Secreted), eotaxin and the macrophage inflammatory proteins l ⁇ and l ⁇ (MJP- l ⁇ and MIP-I ⁇ ).
• chemokines are mediated by subfamilies of G protein-coupled receptors, among which are the receptors designated CCRl, CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CCRlO, CXCRl, CXCR2, CXCR3 and CXCR4.
• G protein-coupled receptors among which are the receptors designated CCRl, CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CCRlO, CXCRl, CXCR2, CXCR3 and CXCR4.
• the present invention provides a compound of formula (I):
• Ar 1 is phenyl or naphthyl, either of which is optionally substituted by chloro, fluoro, methyl or CF 3 ;
• Ar 2 is phenyl, naphthyl, imidazolyl, pyrazinyl, thienyl, thiazolyl, thiadiazolyl, pyridinyl, pyrimidinyl, benzimidazolyl, quinolinyl, quinazolinyl, isoquinolinyl, 5-phenylamino-l,3,4- oxadiazolyl, dihydroquinazolinyl, 3 -pyridinyl- 1,2,4-oxadiazolyl, pyridazinyl or quinoxalinyl; wherein Ar 2 is substituted by CO 2 R' or tetrazolyl; and Ar 2 is optionally additionally substituted by one or more of halogen, hydroxy, nitro, S(O) 1 (C 1-6 alkyl), S(O) 2 NH 2 , S(O) 2 NH(C 1-6 alkyl), S(O) 2 N(C 1-6 alkyl)
• alkyl or alkoxy groups are optionally substituted by NR 1 R 2 ;
• R and R are independently hydrogen or Ci -4 alkyl or together with the nitrogen to which they are attached form a ring (for example azepine, pyrrolidine, piperidine, homopiperidine, morpholine or piperazine), the latter optionally substituted on the distal nitrogen by C 1-4 alkyl;
• R' is hydrogen, C 1-6 alkyl or phenyl(C 1-4 alkyl); wherein the . phenyl is optionally substituted with halogen, hydroxy, nitro, S(O) 1 (Ci -4 alkyl), S(O) 2 NH 2 , S(O) 2 NH(Ci -4 alkyl),
• Certain compounds of the present invention can exist in different isomeric forms (such o as enantiomers, diastereomers, geometric isomers or tautomers).
• the present invention covers all such isomers and mixtures thereof in all proportions.
• the compounds of the invention can be zwitterionic and all such zwitterions are within the invention.
• Suitable salts include acid addition salts such as hydrochloride, dihydrochloride, 5 hydrobromide, phosphate, sulfate, acetate, diacetate, fumarate, maleate, malonate, succinate, tartrate, citrate, oxalate, methanesulfonate, benzenesulfonate o ⁇ p- toluenesulfonate.
• An alkali metal cation is, for example sodium or potassium, and an alkaline earth metal cation is, for example, magnesium or calcium.
• Q The compounds of the invention may exist as solvates (such as hydrates) and the present invention covers all such solvates.
• Halogen Includes fluorine, chlorine, bromine and iodine. Halogen is, for example, fluorine or chlorine.
• Alkyl is straight or branched chain and is, for example, methyl, ethyl, n-propyl, iso- propyl or tert-butyl.
• the present invention provides a compound of formula (I) wherein: Ar 1 is phenyl or naphthyl, either of which is optionally substituted by chloro, fluoro, methyl or CF 3 ; Ar 2 is phenyl, naphthyl, imidazolyl, pyrazinyl, thienyl, thiazolyl, thiadiazolyl, pyridinyl, pyrimidinyl, benzimidazolyl, quinolinyl, quinazolinyl, isoquinolinyl 5-phenylamino-l,3,4-oxadiazoIyI, dihydroquinazolinyl or 3-pyridinyl ⁇ l,2,4- oxadiazolyl; wherein Ar 2 is substituted by CO 2
• Ar 1 is phenyl optionally substituted (for example with one, two or three of the same or different) with fluorine, chlorine or methyl.
• the present invention provides a compound wherein Ar 1 is phenyl substituted by one, two or three s ⁇ bstituents independently selected from: fluorine, chlorine and methyl.
• the present invention provides a compound of formula (I) wherein Ar 1 is phenyl substituted by one, two or three substituents independently selected from: chlorine, methyl and CF 3 .
• the present invention provides a compound of formula (I) wherein Ar 1 is, for example, 3-chlorophenyl, 4-chlorophenyl, 4-fluorophenyl, 3,4-difluorophenyl, 2-methyl-4-chlorophenyl, 2-methylphenyl, 3,4-dichlorophenyl, 2,4-dichloro-3- methylphenyl or 3,4-dichloro-2-methylphenyl.
• Ar 1 is 3-methyl-4- chlorophenyl and 3-CF 3 -4-chloropheriyl.
• the present invention provides a compound of formula (I) wherein Ar 1 is 3,4-dichlorophenyl, 3,4-dichloro-2-methylphenyl, 3-methyl-4-chlorophenyl or 3-CF 3 -4-chlorophenyl.
• Ar 1 is 3,4-dichlorophenyl, 3,4-dichloro-2-methylphenyl, 3-methyl-4-chlorophenyl or 3-CF 3 -4-chlorophenyl.
• the present invention provides a compound of formula (I) wherein
• Ar 2 (which is, for example, phenyl or pyridinyl) is substituted by CO 2 R', and optionally additionally substituted by one or more of the substituents recited above.
• the present invention provides a compound of formula (I) wherein Ar 2 is phenyl or pyridinyl (for example pyridin-2-yl) substituted as recited above.
• Ar 2 is phenyl substituted as recited above.
• Ar 2 is pyridinyl (for example pyridin-2-yl) substituted as recited above.
• the present invention provides a compound of formula (I) wherein Ar 2 (which is, for example, phenyl or pyridinyl) is substituted by CO 2 R' or tetrazolyl (wherein R' is hydrogen or C 1-4 alkyl) and is optionally additionally substituted by halogen, hydroxyl, C 1-4 alkyl, CF 3 , C 1-4 alkoxy, S(O) 2 NH 2 , NH 2 or CH 2 (morpholin-4- yi).
• Ar 2 which is, for example, phenyl or pyridinyl
• CO 2 R' or tetrazolyl wherein R' is hydrogen or C 1-4 alkyl
• R' is hydrogen or C 1-4 alkyl
• the present invention provides a compound of formula (I) wherein Ar 2 (which is, for example, phenyl or pyridinyl) is substituted by CO 2 H and is optionally additionally substituted by halogen (for example fluoro or chloro), C 1-4 alkyl (for example methyl), CF 3 or NH 2 .
• Ar 2 is phenyl substituted in the 4-position by CO 2 R' (for example R' is hydrogen) and optionally additionally substituted as recited above.
• the compounds of the present invention can be prepared as described below or by adaptation of methods described in the art (for example WO 01/14333).
• a compound of formula (I) can be prepared by reacting a compound of formula (II):
• L 1 is a leaving group (for example halogen, such as chloro), with a compound Ar 2 SH in the presence of a suitable base (for example sodium acetate) in a suitable solvent (such as an aliphatic alcohol, for example ethanol) at a suitable temperature (such as 50- 12O 0 C, for example reflux).
• a suitable base for example sodium acetate
• a suitable solvent such as an aliphatic alcohol, for example ethanol
• a compound of formula (t) wherein CO 2 R' is an ester can be prepared by reacting a compound of formula (III):
• M + is an alkali metal cation (such as sodium, lithium or potassium), with Ar 2 X where X is a leaving group (for example halogen, such as chloro or fluoro) in a solvent such as DMF at a suitable temperature (such as 0-150 0 C).
• a suitable temperature such as 0-150 0 C.
• a compound of formula (I) wherein CO 2 R' is an ester can be prepared by reacting a compound of formula (IV):
• HO SAr2 in the presence of a suitable coupling agent (such as HATU) 3 in the presence of a suitable base (such as a tertiary amine, for example Hiinig's base), in a suitable solvent (such as N- methylpyrrolidinone) at a temperature in the range -10 to 3O 0 C.
• a suitable coupling agent such as HATU
• a suitable base such as a tertiary amine, for example Hiinig's base
• a suitable solvent such as N- methylpyrrolidinone
• a compound of formula (I) wherein CO 2 R' is an ester can be s prepared by reacting a compound of formula (IV) with a compound of formula (VI):
• a suitable base for example triethylamine
• a suitable solvent such as dichloromethane
• a compound of formula (I) wherein CO 2 R' is an ester can be i o prepared by reacting a compound of formula (VII) :
• a compound of formula (I) wherein CO 2 R' is an ester can be is prepared by reacting a compound of formula (VI) with Ar 1 CH 2 L where L is a leaving group, (for example a halogen such as bromine) in the presence of a suitable base (such as K 2 CO 3 ) in a suitable solvent (such as DMF).
• a suitable base such as K 2 CO 3
• a suitable solvent such as DMF
• CO 2 R' is an ester by a standard esterification method well known in the art
• CO 2 R' is COfR +
• said compound can be prepared by reacting a compound wherein R' is hydrogen or alkyl or phenylalkyl, with a suitable alkali metal or alkaline earth metal hydroxide.
• R' is hydrogen or alkyl or phenylalkyl
• suitable alkali metal or alkaline earth metal hydroxide Such methods are described in undergraduate organic chemistry textbooks (such as Advanced Organic Chemistry by J March, 5 th edition M B Smith and J March, Wiley, 2001).
• a compound of formula (I) wherein Ar 2 is substituted by tetrazole can be prepared by reaction of a compound of formula. (I) wherein Ar 2 is substituted by cyano by reaction with a compound of formula (VIII):
• a mild acid for example ammonium chloride.
• a compound of formula (II) may be prepared by reaction of a compound of formula (IV) with a compound of formula (IX):
• a suitable base for example triethylamine
• a suitable solvent such as dichloromethane
• a compound of formula (HI) may be prepared from a compound of formula (X) wherein R 10 represents an alkyl or aryl group, typically methyl:
• nuc eophile for example sodium m °ethoxide
• a suitable solvent for example methanol
• a compound of formula (X) may be prepared by reaction of a compound of formula (II) with a compound of formula (XI) :
• a base for example triethylamine
• a suitable solvent for example dichloromethane
• a compound of formula (VI) may be prepared by reaction of a compound of formula (XII):
• a compound of formula (V) in the presence of a suitable coupling agent (such as HATU), in the presence of a suitable base (such as a tertiary amine, for example triethylamine), in a suitable solvent (such as N-methylpyrrolidinone) at a temperature in the range -10 to 30°C.
• a suitable coupling agent such as HATU
• a suitable base such as a tertiary amine, for example triethylamine
• a suitable solvent such as N-methylpyrrolidinone
• a compound of formula (VI) may be prepared by reaction of a compound of formula (XII) with a compound of formula (VI) in the presence of a suitable base, for example triethylamine, in a suitable solvent (such as dichloromethane) at a temperature in the range (- 78 to 2O 0 C).
• a suitable base for example triethylamine
• a suitable solvent such as dichloromethane
• the present invention provides processes for the preparation of compounds of formula (I).
• the compounds of formula (I) have activity as pharmaceuticals, in particular as modulators of chemokine receptor (for example CCR3) activity, and may be used in the treatment of autoimmune, inflammatory, proliferative or hyperproliferative diseases, or immunologically-mediated diseases (including rejection of transplanted organs or tissues and Acquired Immunodeficiency Syndrome (AIDS)). Examples of these conditions are: 1.
• obstructive diseases of the airways including: asthma, including bronchial, allergic, intrinsic, extrinsic, exercise-induced, drug-induced (including aspirin and NS AID-induced) and dust-induced asthma, both intermittent and persistent and of all severities, and other causes of airway hyper-responsiveness; chronic obstructive pulmonary disease (COPD); bronchitis, including infectious and eosinophilic bronchitis; emphysema; bronchiectasis; cystic fibrosis; sarcoidosis; farmer's lung and related diseases; hypersensitivity pneumonitis; lung fibrosis, including cryptogenic fibrosing alveolitis, idiopathic interstitial pneumonias, fibrosis complicating anti-neoplastic therapy and chronic infection, including tuberculosis and aspergillosis and other fungal infections; complications of lung transplantation; vasculitic and thrombotic disorders of the lung vasculature
• osteoarthritides associated with or including osteoarthritis/osteoarthrosis both primary and secondary to, for example, congenital hip dysplasia; cervical and lumbar spondylitis,, and low back and neck pain; osteoporosis; rheumatoid arthritis and StilPs disease; seronegative spondyloarthropathies including ankylosing spondylitis, psoriatic arthritis, reactive arthritis and undifferentiated spondarthropathy; septic arthritis and other infection-related arthopathies and bone disorders such as tuberculosis, including Potts' disease and Poncet's syndrome; acute and chronic crystal-induced synovitis including urate gout, calcium pyrophosphate deposition disease, and calcium apatite related tendon, bursal and synovial inflammation; Behcet's disease; primary and secondary Sjogren's syndrome; systemic sclerosis and limited scleroderma; systemic lupus erythemat
• arthritides for example rheumatoid arthritis, osteoarthritis, gout or crystal arthropathy
• other joint disease such as intervertebral disc degeneration or temporomandibular joint degeneration
• bone remodelling disease such as osteoporosis, Pagefs disease or osteonecrosis
• polychondritis scleroderma, mixed
• skin psoriasis, atopic dermatitis, contact dermatitis or other eczematous dermatoses, and delayed-type hypersensitivity reactions; phyto- and photodermatitis; seborrhoeic dermatitis, dermatitis herpetiformis, lichen planus, lichen sclerosus et atrophica, pyoderma is gangrenosum, skin sarcoid, discoid lupus erythematosus, pemphigus, pemphigoid, epidermolysis bullosa, urticaria, angioedema, vasculitides, toxic erythemas, cutaneous eosinophilias, alopecia areata, male-pattern baldness, Sweet's syndrome, Weber-Christian syndrome, erythema multiforme; cellulitis, both infective and non-infective; panniculitis; cutaneous lymphomas, non-mela
• eyes blepharitis; conjunctivitis, including perennial and vernal allergic conjunctivitis; ulceris; anterior and posterior uveitis; choroiditis; autoimmune; degenerative or inflammatory disorders affecting the retina; ophthalmitis including sympathetic ophthalmitis; sarcoidosis; infections including viral , fungal, and bacterial;
• gastrointestinal tract glossitis, gingivitis, periodontitis; oesophagitis, including reflux; eosinophilic gastro-enteritis, mastocytosis, Crohn's disease, colitis including ulcerative colitis, proctitis, pruritis ani; coeliac disease, irritable bowel syndrome, and food-related allergies which may have effects remote from the gut (for example migraine, rhinitis or eczema);
• abdominal hepatitis, including autoimmune, alcoholic and viral; fibrosis and cirrhosis of the liver; cholecystitis; pancreatitis, both acute and chronic; 8. genitourinary: nephritis including interstitial and glomerulonephritis; nephrotic syndrome; cystitis including acute and chronic (interstitial) cystitis and Hunner's ulcer; acute and chronic urethritis, prostatitis, epididymitis, oophoritis and salpingitis; vulvovaginitis; Peyronie's disease; erectile dysfunction (both male and female); 9. allograft rejection: acute and chronic following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea or following blood transfusion; or chronic graft versus host disease;
• CNS Alzheimer's disease and other dementing disorders including CJD and nvCJD; amyloidosis; multiple sclerosis and other demyelinating syndromes; cerebral atherosclerosis and vasculitis; temporal arteritis; myasthenia gravis; acute and chronic pain (acute, intermittent or persistent, whether of central or peripheral origin) including visceral pain, headache, migraine, trigeminal neuralgia, atypical facial pain, joint and bone pain, pain arising from cancer and rumor invasion, neuropathic pain syndromes including diabetic, post-herpetic, and HTV-associated neuropathies; neurosarcoidosis; central and peripheral nervous system complications of malignant, infectious or autoimmune processes;
• cardiovascular atherosclerosis, affecting the coronary and peripheral circulation; pericarditis; myocarditis , inflammatory and auto-immune cardiomyopathies including myocardial sarcoid; ischaemic reperfusion injuries; endocarditis, valvulitis, and aortitis including infective (for example syphilitic); vasculitides; disorders of the proximal and peripheral veins including phlebitis and thrombosis, including deep vein thrombosis and complications of varicose veins;
• oncology treatment of common cancers including prostate, breast, lung, ovarian, pancreatic, bowel and colon, stomach, skin and brain tumors and malignancies affecting the bone marrow (including the leukaemias) and lymphoproliferative systems, such as Hodgkin's and non-Hodgkin's lymphoma; including the prevention and treatment of metastatic disease and tumour recurrences, and paraneoplastic syndromes; or, 15.
• gastrointestinal tract Coeliac disease, proctitis, eosinopilic gastro-enteritis, mastocytosis, Crohn's disease, ulcerative colitis, microscopic colitis, indeterminant colitis, irritable bowel disorder, irritable bowel syndrome, non-inflammatory diarrhea, food- related allergies which have effects remote from the gut, e.g., migraine, rhinitis and eczema.
• a method for treating a chemokine mediated disease state for example a CCR3 mediated disease state
• a mammal such as man, suffering from, or at risk of, said disease state
• which comprises administering to a mammal in need of such treatment a therapeutically effective amount of a compound of the formula (I) or a pharmaceutically acceptable salt thereof.
• a method for treating a sign and/or symptom of what is commonly referred to as a cold in a mammal, s such as man, suffering from, or at risk of, said disease state which comprises administering to a mammal in need of such treatment a therapeutically effective amount of a compound of the formula (I) or a pharmaceutically acceptable salt thereof.
• the invention also provides a compound of the formula (I), or a pharmaceutically acceptable salt thereof, for use in therapy.
• the invention provides the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in therapy (for example modulating chemokine receptor activity (for example CCR.3 receptor activity) or treating a sign and/or symptom of what is commonly referred to as a cold).
• the invention further provides the use of a compound of formula (I), or a s pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the treatment of:
• respiratory tract obstructive diseases of the airways including: asthma, including bronchial, allergic, intrinsic, extrinsic, exercise-induced, drug-induced (including aspirin and NSAID-induced) and dust-induced asthma, both intermittent and persistent and of all 0 severities, and other causes of airway hyper-responsiveness; chronic obstructive pulmonary disease (COPD); bronchitis, including infectious and eosinophilic bronchitis; emphysema; bronchiectasis; cystic fibrosis; sarcoidosis; farmer's lung and related diseases; hypersensitivity pneumonitis; lung fibrosis, including cryptogenic fibrosing alveolitis, idiopathic interstitial pneumonias, fibrosis complicating anti-neoplastic therapy and chronic infection, including tuberculosis and aspergillosis and other fungal infections; complications of lung transplantation; vasculitic and thrombotic disorders of the lung vascul
• osteoarthritides associated with or including osteoarthritis/osteoarthrosis both primary and secondary to, for example, congenital hip dysplasia; cervical and lumbar spondylitis, and low back and neck pain; osteoporosis; rheumatoid arthritis and Still's disease; seronegative spondyloarthropathies including ankylosing spondylitis, psoriatic arthritis, reactive arthritis and undifferentiated spondarthropathy; septic arthritis and other infection-related arthopathies and bone disorders such as tuberculosis, including Potts' disease and Poncet's syndrome; acute and chronic crystal-induced synovitis including urate gout, calcium pyrophosphate deposition disease, and calcium apatite related tendon, bursal and synovial inflammation; Behcet's disease; primary and secondary Sjogren's syndrome; systemic sclerosis and limited scleroderma; systemic lupus erythemato
• arthritides for example rheumatoid arthritis, osteoarthritis, gout or crystal arthropathy
• other joint disease such as intervertebral disc degeneration or temporomandibular joint degeneration
• bone remodelling disease such as osteoporosis, Paget's disease or osteonecrosis
• polychondritits scleroderma
• mixed connective tissue disorder spondyloarthropathies or periodontal disease (such as periodontitis);
• skin psoriasis, atopic dermatitis, contact dermatitis or other eczematous dermatoses, and delayed-type hypersensitivity reactions; phyto- and photodermatitis; seborrhoeic .
• eyes blepharitis; conjunctivitis, including perennial and vernal allergic conjunctivitis; ulceris; anterior and posterior uveitis; choroiditis; autoimmune; degenerative or inflammatory disorders affecting the retina; ophthalmitis including sympathetic ophthalmitis; sarcoidosis; infections including viral , fungal, and bacterial;
• gastrointestinal tract glossitis, gingivitis, periodontitis; oesophagitis, including reflux; o eosinophilic gastro-enteritis, mastocytosis, Crohn's disease, colitis including ulcerative colitis, proctitis, pruritis ani; coeliac disease, irritable bowel syndrome, and food-related allergies which may have effects remote from the gut (for example migraine, rhinitis or eczema);
• abdominal hepatitis, including autoimmune, alcoholic and viral; fibrosis and cirrhosis 5 of the liver; cholecystitis; pancreatitis, both acute and chronic;
• nephritis including interstitial and glomerulonephritis; nephrotic syndrome; cystitis including acute and chronic (interstitial) cystitis and Hunner's ulcer; acute and chronic urethritis, prostatitis, epididymitis, oophoritis and salpingitis; vulvovaginitis; Peyronie's disease; erectile dysfunction (both male and female); 0
• allograft rejection acute and chronic following, for example, transplantation of kidney, heart, liver, lung, bone marrow, skin or cornea or following blood transfusion; or chronic graft versus host disease; 10.
• CNS Alzheimer's disease and other dementing disorders including CJD and nvCJD; amyloidosis; multiple sclerosis and other demyelinating syndromes; cerebral atherosclerosis and vasculitis; temporal arteritis; myasthenia gravis; acute and chronic pain (acute, intermittent or persistent, whether of central or peripheral origin) including visceral pain, headache, migraine, trigeminal neuralgia, atypical facial pain, joint and bone pain, pain arising from cancer and tumor invasion, neuropathic pain syndromes including diabetic, post-herpetic, and HIV-associated neuropathies; neurosarcoidosis; central and peripheral nervous system complications of malignant, infectious or autoimmune processes; 11.
• cardiovascular atherosclerosis, affecting the coronary and peripheral circulation; pericarditis; myocarditis , inflammatory and auto-immune cardiomyopathies including myocardial sarcoid; ischaemic reperfusion injuries; endocarditis, valvulitis, and aortitis including infective (for example syphilitic); vasculitides; disorders of the proximal and o peripheral veins including phlebitis and thrombosis, including deep vein thrombosis and complications of varicose veins;
• oncology treatment of common cancers including prostate, breast, lung, ovarian, pancreatic, bowel and colon, stomach, skin and brain tumors and malignancies affecting the bone marrow (including the leukaemias) and lymphoproliferative systems, such as 5 Hodgkin's and non-Hodgkin's lymphoma; including the prevention and treatment of metastatic disease and tumour recurrences, and paraneoplastic syndromes; or,
• gastrointestinal tract Coeliac disease, proctitis, eosinopilic gastro-enteritis, mastocytosis, Crohn's disease, ulcerative colitis, microscopic colitis, indeterminant colitis, irritable bowel disorder, irritable bowel syndrome, non-inflammatory diarrhea, food- 0 related allergies which have effects remote from the gut, e.g., migraine, rhinitis and eczema; in a mammal (for example man).
• the invention provides a compound of formula (I), or a pharmaceutically acceptable salt thereof, for use in the treatment of asthma ⁇ such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late asthma or airways hyper-responsiveness) ⁇ ; or rhinitis ⁇ including acute, allergic, atrophic or chronic rhinitis, such as rhinitis caseosa, hypertrophic rhinitis, rhinitis purulenta, rhinitis sicca or rhinitis medicamentosa; membranous rhinitis including croupous, fibrinous or pseudomembranous rhinitis or scrofulous rhinitis; seasonal rhinitis including rhinitis nervosa (hay fever) or vasomotor rhinitis ⁇ .
• asthma such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late
• a compound of formula (I), or a pharmaceutically acceptable salt thereof is useful in the treatment of asthma.
• the present invention also provides a the use of a compound of formula (I), or a pharmaceutically acceptable salt thereof, in the manufacture of a medicament for use in the treatment of asthma ⁇ such as bronchial, allergic, intrinsic, extrinsic or dust asthma, particularly chronic or inveterate asthma (for example late asthma or airways hyper- responsiveness) ⁇ ; or rhinitis ⁇ including acute, allergic, atrophic or chronic rhinitis, such as rhinitis caseosa, hypertrophic rhinitis, rhinitis purulenta, rhinitis sicca or rhinitis medicamentosa; membranous rhinitis including croupous, fibrinous or pseudomembranous rhinitis or scrofulous rhinitis; seasonal rhinitis including rhinitis nervosa (hay fever) or vasomotor rhinitis ⁇ .
• asthma such as bronchial, allergic, intrinsic, extrinsic or
• the present invention provides a pharmaceutical composition which comprises a compound of the formula (I), or a pharmaceutically acceptable salt thereof (active ingredient), and a pharmaceutically acceptable adjuvant, diluent or carrier.
• the present invention provides a process for the preparation of said composition which comprises mixing active ingredient with a pharmaceutically acceptable adjuvant, diluent or carrier.
• the pharmaceutical composition will, for example, comprise from 0.05 to 99 %w (per cent by weight), such as from 0.05 to 80 %w, for example from 0.10 to 70 %w, such as from 0.10 to 50 %w, of active ingredient, all percentages by weight being based on total composition.
• a compound of the invention, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition of this invention, or a combination of this invention as described below, can be administered in a standard manner for the disease condition that it is desired to treat, for example it can be administered via topical (such as to the lung and/or airways or to the skin), oral, rectal or parenteral (for example intramuscular, intravenous or intra-articular) administration.
• topical such as to the lung and/or airways or to the skin
• parenteral for example intramuscular, intravenous or intra-articular
• a suitable pharmaceutical composition of this invention is one suitable for oral administration in unit dosage form, for example a tablet or capsule which contains between 0.1 mg and 1 g of active ingredient.
• Each patient may receive, for example, a dose of O.Olmgkg '1 to lOOmgkg "1 , for example in the range of O.lmgkg "1 to lOragkg 1 , of the active ingredient administered, for example, 1 to 4 times per day.
• the invention further relates to a combination therapy wherein a compound of the invention, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition or formulation comprising a compound of the invention, is administered concurrently or sequentially or as a combined preparation with another therapeutic agent or agents, for the treatment of one or more of the conditions listed.
• the compounds of the invention may be combined with agents listed below.
• the invention further relates to combination therapies wherein a compound of the invention, or a pharmaceutically acceptable salt thereof, or a pharmaceutical composition or formulation comprising a compound of the invention, or a pharmaceutically acceptable salt thereof, is administered concurrently or sequentially or as a combined preparation with one or more of the therapeutic agents listed below, for the treatment of one or more of the conditions listed.
• a compound of the invention can be combined with one or more of the therapeutic agents listed below.
• NSAID non-steroidal anti-inflammatory agent
• COX-I / COX-2 inhibitors whether applied topically or systemically
• piroxicam diclofenac
• propionic acids such as naproxen, flurbiprofen, fenoprofen, ketoprofen and ibuprofen
• fenamates such as mefenamic acid, indomethacin, sulindac, azapropazone, pyrazolones such as phenylbutazone, salicylates such as aspirin
• selective COX-2 inhibitors such as meloxicam, celecoxib, rofecoxib, valdecoxib, lumarocoxib, parecoxib and etoricoxib
• COX-2 inhibitors such as meloxicam, celecoxib, rofecoxib, valdecoxib, lumarocoxib, parecoxib and etoricoxib
• COX-2 inhibitors such as
• a cytokine, or agonist or antagonist of cytokine function including an agent which acts on a cytokine signalling pathway such as a modulator of the SOCS system
• cytokine signalling pathway such as a modulator of the SOCS system
• IGF-I insulin-like growth factor type I
• IL interleukin
• IL- ⁇ tumour necrosis factor alpha
• TNF- ⁇ tumour necrosis factor alpha
• TNF receptor antagonist including immunoglobulin molecule (such as etanercept) and a low-molecular- weight agent such as pentoxyfylline.
• a monoclonal antibody targeting B-Lymphocytes such as CD20 (rituximab), MRA-aIL16R and T-Lymphocytes, CTLA4-Ig, HuMax 11-15).
• a modulator of chemokine receptor function such as an antagonist of CCRl,
• CCR2, CCR2A, CCR2B, CCR3, CCR4, CCR5, CCR6, CCR7, CCR8, CCR9, CCRlO and CCRIl for the C-C family
• CXCRl, CXCR2, CXCR3, CXCR4 and CXCR5 for the C-
• MMP matrix metalloprotease
• a stromelysin such as a collagenase, or a gelatinase, as well as aggrecanase
• MMP-I collagenase-1
• MMP-8 collagenase-2
• MMP-13 collagenase-3
• MMP-3 stromelysin-1
• MMP-10 stromelysin-2
• MMP-Il stromelysin-3
• a leukotriene biosynthesis inhibitor, 5-lipoxygenase (5-LO) inhibitor or 5- lipoxygenase activating protein (FLAP) antagonist such as; zileuton; ABT-761; fenleuton; tepoxalin; Abbott-79175 ; Abbott-85761 ; a N-(5-substituted)-thiophene-2- alkylsulfonamide; a 2,6-di-tert-butylphenolhydrazone; a methoxytetrahydropyran such as Zeneca ZD-2138; the compound SB-210661; a pyridinyl-substituted 2-cyanonaphthalene compound such as L-739,010; a 2-cyanoquinoline compound such as L-746,530; or an indole or quinoline compound such as MK-591, MK-886, or BAY x 1005.
• 5-LO 5-lipoxygenase
• FLAP 5- lipoxygen
• a receptor antagonist for leukotrienes (LT) B4, LTC4, LTD4, and LTE4. selected from the group consisting of a phenothiazin-3-1 such as L-651,392; an amidino compound such as CGS-25019c; a benzoxalamine such as ontazolast; a benzenecarboximidamide such as BIIL 284/260; or a compound such as zafirlukast, ablukast, montelukast, pranlukast, verlukast (MK-679), RG-12525, Ro-245913, iralukast (CGP 45715A), or BAY x 7195.
• a phenothiazin-3-1 such as L-651,392
• an amidino compound such as CGS-25019c
• a benzoxalamine such as ontazolast
• a benzenecarboximidamide such as BIIL 284/260
• a phosphodiesterase (PDE) inhibitor such as a methylxanthanine including theophylline and aminophylline; a selective PDE isoenzyme inhibitor including a PDE4 inhibitor an inhibitor of the isoform PDE4D, or an inhibitor of PDE5.
• PDE phosphodiesterase
• a histamine type 1 receptor antagonist such as cetirizine, loratadine, desloratadine, fexofenadine, acrivastine, terfenadine, astemizole, azelastine, levocabastine, chlorpheniramine, promethazine, cyclizine, or mizolastine; applied orally, topically or parenterally.
• a proton pump inhibitor such as omeprazole
• a gastroprotective histamine type 2 receptor antagonist An antagonist of the histamine type 4 receptor.
• An alpha- l/alpha-2 adrenoceptor agonist vasoconstrictor sympathomimetic agent such as propylhexedrine, phenylephrine, phenylpropanolamine, ephedrine, pseudoephedrine, naphazoline hydrochloride, oxymetazoline hydrochloride, tetrahydrozoline hydrochloride, xylometazoline hydrochloride, tramazoline hydrochloride or ethylnorepinephrine hydrochloride.
• An anticholinergic agent including muscarinic receptor (Ml, M2, and M3) antagonist such as atropine, hyoscine, glycopyrrrolate, ipratropium bromide, tiotropium bromide, oxitropium bromide, pirenzepine or telenzepine.
• Ml, M2, and M3 antagonist such as atropine, hyoscine, glycopyrrrolate, ipratropium bromide, tiotropium bromide, oxitropium bromide, pirenzepine or telenzepine.
• a beta-adrenoceptor agonist such as isoprenaline, salbutamol, formoterol, salmeterol, terbutaline, orciprenaline, bitolterol mesylate, pirbuterol or indacaterol, or a chiral enantiomer thereof.
• a chromone such as sodium cromoglycate or nedocromil sodium.
• a glucocorticoid such as flunisolide, triamcinolone acetonide, beclomethasone dipropionate, budesonide, fluticasone propionate, ciclesonide or mometasone furoate.
• An agent that modulates a nuclear hormone receptor such as a PPAR.
• immunoglobulin (Ig) or Ig preparation or an antagonist or antibody modulating Ig function such as anti-IgE (for example omalizumab).
• Another systemic or topically-applied anti-inflammatory agent such as thalidomide or a derivative thereof, a retinoid, dithranol or calcipotriol.
• An aminosalicylate or a sulfapyridine such as sulfasalazine, mesalazine, balsalazide or olsalazine; an immunomodulatory agent such as a thiopurine, or a corticosteroid such as budesonide.
• An antibacterial agent such as a penicillin derivative, a tetracycline, a macrolide, a beta-lactam, a fluoroquinolone, metronidazole, an inhaled aminoglycoside; an antiviral agent including acyclovir, famciclovir, valaciclovir, ganciclovir, cidofovir, amantadine, rimantadine, ribavirin, zanamavir and oseltamavir; a protease inhibitor such as indinavir, nelfinavir, ritonavir, and saquinavir; a nucleoside reverse transcriptase inhibitor such as didanosine, lamivudine, stavudine, zalcitabine or zidovudine; or a non-nucleoside reverse transcriptase inhibitor such as nevirapine or efavirenz.
• an antiviral agent including acycl
• a cardiovascular agent such as a calcium channel blocker, a beta-adrenoceptor blocker, an angiotensin-converting enzyme (ACE) inhibitor, an angiotensin-2 receptor antagonist; a lipid lowering agent such as a statin or a fibrate; a modulator of blood cell morphology such as pentoxyfylline; thrombolytic, or an anticoagulant such as a platelet aggregation inhibitor.
• ACE angiotensin-converting enzyme
• an angiotensin-2 receptor antagonist such as a statin or a fibrate
• a modulator of blood cell morphology such as pentoxyfylline
• thrombolytic thrombolytic
• an anticoagulant such as a platelet aggregation inhibitor.
• a CNS agent such as an antidepressant (such as sertraline), an anti-Parkinsonian drug (such as deprenyL L-dopa, ropinirole, pramipexole, a MAOB inhibitor such as selegine and rasagiline, a comP inhibitor such as tasmar, an A-2 inhibitor, a dopamine reuptake inhibitor, an NMDA antagonist, a nicotine agonist, a dopamine agonist or an inhibitor of neuronal nitric oxide synthase), or an anti- Alzheimer's drug such as donepezil, rivastigmine, tacrine, a COX-2 inhibitor, propentofylline or metrifonate.
• an antidepressant such as sertraline
• an anti-Parkinsonian drug such as deprenyL L-dopa, ropinirole, pramipexole, a MAOB inhibitor such as selegine and rasagiline
• An agent for the treatment of acute or chronic pain such as a centrally or peripherally-acting analgesic (for example an opioid or derivative thereof), carbamazepine, phenytoin, sodium valproate, amitryptiline or other anti-depressant agent, paracetamol, or a non-steroidal anti-inflammatory agent.
• analgesic for example an opioid or derivative thereof
• carbamazepine for example an opioid or derivative thereof
• phenytoin for example an opioid or derivative thereof
• sodium valproate for example an opioid or derivative thereof
• amitryptiline or other anti-depressant agent for example an opioid or derivative thereof
• paracetamol for example an opioid or derivative thereof
• a non-steroidal anti-inflammatory agent for example an opioid or derivative thereof
• a parenterally or topically-applied (including inhaled) local anaesthetic agent such as lignocaine or a derivative thereof.
• An anti-osteoporosis agent including a hormonal agent such as raloxifene, or a biphosphonate such as alendronate.
• -receptor antagonist for example colchicine
• anti-gout agent for example colchicine
• xanthine oxidase inhibitor for example allopurinol
• uricosuric agent for example probenecid, sulfinpyrazone or benzbromarone
• growth hormone secretagogue for example transforming growth factor (TGF ⁇ );
• PDGF platelet- derived growth factor
• fibroblast growth factor for example basic fibroblast growth factor (bFGF);
• GM- CSF granulocyte macrophage colony stimulating factor
• capsaicin cream for example tachykinin NK.subl.
• NKP-608C SB-233412 (talnetant) or D-4418
• elastase inhibitor such as UT- 77 or ZD-0892
• TACE TNF-alpha converting enzyme inhibitor
• iNOS induced nitric oxide synthase
• chemoattractant receptor-homologous molecule expressed on TH2 cells such as a CRTH2 antagonist
• inhibitor of P38 agent modulating the function of Toll-like receptors (TLR),
• agent modulating the activity of purinergic receptors such as P2X7
• inhibitor of transcription factor activation such as NFkB, API, or STATS
• a glucocorticoid receptor modulator such as an agonist, for example a non-steroidal agonist.
• a therapeutic agent for the treatment of cancer for example: (i) an antiproliferative/antineoplastic drug or a combination thereof, as used in medical oncology, such as an alkylating agent (for example cis-platin, carboplatin, cyclophosphamide, nitrogen mustard, melphalan, chlorambucil, busulphan or a nitrosourea); an antimetabolite (for example an antifolate such as a fluoropyrimidine like 5-fluorouracil or tegafur, raltitrexed, methotrexate, cytosine arabinoside, hydroxyurea, gemcitabine or paclitaxel); an antitumour antibiotic (for example an anthracycline such as adriamycin, bleomycin, doxorubicin, daunomycin, epirubicin, idarubicin, mitomycin-C, dactinomycin or mithramycin); an antimitotic agent (for
• an agent which inhibits cancer cell invasion for example a metalloproteinase inhibitor like marimastat or an inhibitor of urokinase plasminogen activator receptor function
• an inhibitor of growth factor function for example: a growth factor antibody (for example the anti-erbb2 antibody trastuzumab, or the anti-erbbl antibody cetuximab
• a farnesyl transferase inhibitor for example an EGFR family tyrosine kinase inhibitor such as N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3- morpholinopropoxy)quinazolin-4-amine (gefitinib, AZD 1839), N-(3-ethynylphenyl)-6,7- bis(2-methoxyethoxy)quinazolin-4-amine (erlotinib, OSI-774) or 6-acrylamido-N-(3- chloro-4-fluorophenyl)-7-(3-morpholinopropoxy)quinazolin-4-amine (CI 1033)), an inhibitor of the platelet-derived growth factor family, or an inhibitor of the hepatocyte growth factor family;
• an EGFR family tyrosine kinase inhibitor such as N-(3-chloro-4-fluorophenyl)-7-methoxy-6-(3
• an antiangiogenic agent such as one which inhibits the effects of vascular endothelial growth factor (for example the anti-vascular endothelial cell growth factor antibody bevacizumab, a compound disclosed in WO 97/22596, WO 97/30035, WO 97/32856 or WO 98/13354), or a compound that works by another mechanism (for example linomide, an inhibitor of integrin ⁇ v ⁇ 3 function or an angiostatin);
• vascular endothelial growth factor for example the anti-vascular endothelial cell growth factor antibody bevacizumab, a compound disclosed in WO 97/22596, WO 97/30035, WO 97/32856 or WO 98/13354
• a compound that works by another mechanism for example linomide, an inhibitor of integrin ⁇ v ⁇ 3 function or an angiostatin
• vascular damaging agent such as combretastatin A4, or a compound disclosed in WO 99/02166, WO 00/40529, WO 00/41669, WO 01/92224, WO 02/04434 or WO 02/08213;
• an agent used in antisense therapy for example one directed to one of the targets listed above, such as ISIS 2503, an anti-ras antisense;
• an agent used in a gene therapy approach for example approaches to replace aberrant genes such as aberrant p53 or aberrant BRCAl or BRCA2, GDEPT (gene-directed enzyme pro-drug therapy) approaches such as those using cytosine deaminase, thymidine kinase or a bacterial nitroreductase enzyme and approaches to increase patient tolerance to chemotherapy or radiotherapy such as multi-drug resistance gene therapy; or (ix) an agent used in an immunotherapeutic approach, for example ex- vivo and in- vivo approaches to increase the immunogeniciry of patient tumour cells, such as transfection with cytokines such as interleukin 2, interleukin 4 or granulocyte-macrophage colony stimulating factor, approaches to decrease T-cell anergy, approaches using transfected immune cells such as cytokine-transfected dendritic cells, approaches using cytokine-transfected tumour cell lines and approaches using anti-idiotypic antibodies.
• GDEPT gene-directed enzyme pro-
• n-Butyllithium (1.6 M in hexanes, 3.75 mL) was added and the temperature was maintained for 5 h then methyl iodide (0.75 mL) was added and the mixture was allowed to stand at — 20°C overnight.
• the mixture was poured into 10 % hydrochloric acid and was extracted with diethyl ether, the organics were combined, washed with saturated brine, dried over anhydrous magnesium sulfate ⁇ and then evaporated. Purification by flash chromatography (ethyl acetate / iso-hexane 0.1 :99.9) afforded the subtitle compound (0.179 g).
• reaction mixture was stirred for 2 h.
• the reaction mixture was acidified with acetic s acid and extracted with dichloromethane. The extracts were evaporated and azeotroped using toluene to give the title compound (1 g)
• Lithium hydroxide monohydrdrate (1.8g) was added to a solution of ethyl 2-chloro-5- fluoro-6-[(4-methyl ⁇ henyl)thio]nicotinate (7.Og) in THF (10OmL). Water (2OmL) was added and the solution stirred vigorously for 18h. The mixture was diluted with water (40OmL) and washed with ether. The aqueous was acidified with acetic acid and extracted with ether. The ether was dried and evaporated to give the subtitle compound (6.Og).
• Manganese (IV) oxide (0.08 g) was added to a suspension of methyl 3-0X0-1,2,3,4- tetrahydroquinoxaline-6-carboxylate (0.1 g) in dichloro ⁇ iethane (10 niL). The reaction mixture was stirred, at room temperature, over the weekend. More manganese (IV) oxide
• Example 23 N-[l-(3,4-Dichloroben2yl)piperidm-4-yl]-2- ⁇ [4-(lH-tetrazol-5-yl)phenyl]thio ⁇ acetamide a) 2-[(4-cyanophenyl)thio]-JV-[l-(3,4-dichloroben2yl)piperidin-4-yl]acetamide Prepared by the method of Example 1 using 4-mercapto benzonitrile (0.67 g) to give the subtitle compound as a colourless solid (0.7 g).
• Human eosinophils are isolated from EDTA anticoagulated peripheral blood as previously described (Hansel et al., J. Immunol. Methods, 1991, 145, 105-110). The cells are resuspended at 10x10 6 mL "1 in RPMI containing 200 IU/ mL penicillin, 200 ⁇ g/ mL streptomycin sulfate and supplemented with 10% HIFCS 5 at room temperature. • Eosinophils (700 ⁇ l) ae pre-incubated for 15 mins at 37° C with 7 ⁇ l of either vehicle or compound (10Ox required final concentration in 10% DMSO).
• a chemotaxis plate (ChemoTx, 3 ⁇ m pore, Neuroprobe) can be loaded by adding 28 ⁇ l of a concentration of eotaxin 0.1 to 10OnM (a selective CCR3 agonist over this concentration range) containing a concentration of a compound according to the Examples or solvent to the lower wells of the chemotaxis plate.
• the filter is then placed over the wells and 25 ⁇ l of eosinophil suspension is added to the top of the filter.
• the plate is incubated for 1 hr at 37°C in a humidified incubator with a 95% air/5% CO 2 atmosphere to allow chemotaxis.
• the medium containing cells that had not migrated, is carefully aspirated from above the filter and discarded.
• the filter is then washed once with phosphate buffered saline (PBS) containing 5 mM EDTA to remove any adherent cells.
• PBS phosphate buffered saline
• Cells that have migrated through the filter are pelleted by centrifugation (300xg for 5 mins at room temperature) and the filter removed and the supernatant transferred to each well of a 96-well plate (Costar).
• the pelleted cells are lysed by the addition of 28 ⁇ l of PBS containing 0.5% Triton xlOO followed by two cycles of freeze/thawing. The cell lysate is then added to the supernatant.
• the number of eosinophils migrating can be quantified according to the method of Strath et al., J. Immunol. Methods, 1985, 83, 209 by measuring eosinophil peroxidase activity in the supernatant.
• Human blood collected by venous puncture into 9 mL lithium-heparin tubes, was incubated with the CCR3 agonist eotaxin-2 in the presence of vehicle (0.1% (v/v) DMSO) or test compound for 4 min at 37°C in a deep, 96-square-well plate.
• vehicle 0.1% (v/v) DMSO
• test compound for 4 min at 37°C in a deep, 96-square-well plate.
• the blood was fixed with Optilyse B (100 ⁇ L) at room temperature for 10 min and then the red blood cells were lysed with distilled water (1 mL) for 60 min at room temperature.
• the plate was centrifuged at room temperature for 5 min at 300 g.
• the pellet was re-suspended in assay buffer (PBS without CaCl 2 and MgCl 2 , containing HEPES (10 mM), Glucose (10 mM) and 0.1% (w/v) BSA, pH 7.4)) and the samples were analysed using flow cytometry (FC500, Beckman Coulter).
• assay buffer PBS without CaCl 2 and MgCl 2 , containing HEPES (10 mM), Glucose (10 mM) and 0.1% (w/v) BSA, pH 7.4
• FC500 flow cytometry
• the high autofluorescence of eosinophils allowed them to be identified as a discrete population from the other blood cell types.
• Eosinophil shape was monitored as the refractive index of the eosinophil population as determined using the forward scatter signal in flow cytometry.
• Eotaxin-2 induced a concentration-dependent change in the forward scatter of eosinophils and these data were used to construct a concentration effect curve (E/[A] curve).
• concentration effect curve E/[A] curve
• the rightward displacement of the eotaxin-2 E/[A] curve in the presence of a CCR3 antagonist was used to estimate a pA 2 value in blood using the following equation:
• Membranes prepared from CHO-Kl cells stably expressing recombinant human CCR3, suspended in assay buffer (50 mM Tris-Base, pH 7.4; containing sodium chloride (10OmM) and magnesium chloride (2 mM)) were incubated in the presence of 2 nM [ 3 H]- 4-(2,4-dichloro-3-methylphenoxy)-r-[4-(methylsulfonyl)benzoyl]-l,4'-bipiperidine, along with vehicle (1 % (v/v) DMSO) 3 4-(4-chloro-3-methylphenoxy)-l l -[2-
• pICso values were calculated using a four parameter logistic fit (where pIC 50 is defined as the negative logarithm of the concentration of compound required for 50% reduction in specific [ 3 H]- 4-(2,4-dichloro-3-methylphenoxy)- l'-[4-(methylsulfonyl)benzoyl]-l,4'-bipiperidine binding). Data were presented as mean pKi values (calculated by applying a Cheng-Prussof correction to pICso values) from a minimum of 2 separate experiments. Results are shown in Table I below.
• Frozen human liver microsomes (BD Gentest, Oxford) were defrosted and were then diluted with 0.1 M pH 7.4 phosphate buffer at 4 0 C to 1 mg protein/ml. 0.45 mL aliquots of the microsome suspension were dispensed into flat-bottomed vials (1 per compound) and were allowed to come to room temperature (5 min). During the warming time, 5 ⁇ L of solution of each test compound (typically 100 ⁇ M in DMSO) was dispensed into separate vials resulting in a final DMSO concentration of 1%. 50 ⁇ L of a 10 mM solution of NADPH in phosphate buffer (0.1 M pH 7.4, 37 0 C) was added to each vial to initiate metabolism.

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